1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 */
5
6#include <linux/kthread.h>
7#include <linux/slab.h>
8#include <linux/scatterlist.h>
9
10#include "usbip_common.h"
11#include "vhci.h"
12
13static void setup_cmd_submit_pdu(struct usbip_header *pdup, struct urb *urb)
14{
15 struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv);
16 struct vhci_device *vdev = priv->vdev;
17
18 usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n",
19 usb_pipedevice(urb->pipe), vdev->devid);
20
21 pdup->base.command = USBIP_CMD_SUBMIT;
22 pdup->base.seqnum = priv->seqnum;
23 pdup->base.devid = vdev->devid;
24 pdup->base.direction = usb_pipein(urb->pipe) ?
25 USBIP_DIR_IN : USBIP_DIR_OUT;
26 pdup->base.ep = usb_pipeendpoint(urb->pipe);
27
28 usbip_pack_pdu(pdu: pdup, urb, USBIP_CMD_SUBMIT, pack: 1);
29
30 if (urb->setup_packet)
31 memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8);
32}
33
34static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev)
35{
36 struct vhci_priv *priv, *tmp;
37 unsigned long flags;
38
39 spin_lock_irqsave(&vdev->priv_lock, flags);
40
41 list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) {
42 list_move_tail(list: &priv->list, head: &vdev->priv_rx);
43 spin_unlock_irqrestore(lock: &vdev->priv_lock, flags);
44 return priv;
45 }
46
47 spin_unlock_irqrestore(lock: &vdev->priv_lock, flags);
48
49 return NULL;
50}
51
52static int vhci_send_cmd_submit(struct vhci_device *vdev)
53{
54 struct usbip_iso_packet_descriptor *iso_buffer = NULL;
55 struct vhci_priv *priv = NULL;
56 struct scatterlist *sg;
57
58 struct msghdr msg;
59 struct kvec *iov;
60 size_t txsize;
61
62 size_t total_size = 0;
63 int iovnum;
64 int err = -ENOMEM;
65 int i;
66
67 while ((priv = dequeue_from_priv_tx(vdev)) != NULL) {
68 int ret;
69 struct urb *urb = priv->urb;
70 struct usbip_header pdu_header;
71
72 txsize = 0;
73 memset(&pdu_header, 0, sizeof(pdu_header));
74 memset(&msg, 0, sizeof(msg));
75 memset(&iov, 0, sizeof(iov));
76
77 usbip_dbg_vhci_tx("setup txdata urb seqnum %lu\n",
78 priv->seqnum);
79
80 if (urb->num_sgs && usb_pipeout(urb->pipe))
81 iovnum = 2 + urb->num_sgs;
82 else
83 iovnum = 3;
84
85 iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL);
86 if (!iov) {
87 usbip_event_add(ud: &vdev->ud, SDEV_EVENT_ERROR_MALLOC);
88 return -ENOMEM;
89 }
90
91 if (urb->num_sgs)
92 urb->transfer_flags |= URB_DMA_MAP_SG;
93
94 /* 1. setup usbip_header */
95 setup_cmd_submit_pdu(pdup: &pdu_header, urb);
96 usbip_header_correct_endian(pdu: &pdu_header, send: 1);
97 iovnum = 0;
98
99 iov[iovnum].iov_base = &pdu_header;
100 iov[iovnum].iov_len = sizeof(pdu_header);
101 txsize += sizeof(pdu_header);
102 iovnum++;
103
104 /* 2. setup transfer buffer */
105 if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) {
106 if (urb->num_sgs &&
107 !usb_endpoint_xfer_isoc(epd: &urb->ep->desc)) {
108 for_each_sg(urb->sg, sg, urb->num_sgs, i) {
109 iov[iovnum].iov_base = sg_virt(sg);
110 iov[iovnum].iov_len = sg->length;
111 iovnum++;
112 }
113 } else {
114 iov[iovnum].iov_base = urb->transfer_buffer;
115 iov[iovnum].iov_len =
116 urb->transfer_buffer_length;
117 iovnum++;
118 }
119 txsize += urb->transfer_buffer_length;
120 }
121
122 /* 3. setup iso_packet_descriptor */
123 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
124 ssize_t len = 0;
125
126 iso_buffer = usbip_alloc_iso_desc_pdu(urb, bufflen: &len);
127 if (!iso_buffer) {
128 usbip_event_add(ud: &vdev->ud,
129 SDEV_EVENT_ERROR_MALLOC);
130 goto err_iso_buffer;
131 }
132
133 iov[iovnum].iov_base = iso_buffer;
134 iov[iovnum].iov_len = len;
135 iovnum++;
136 txsize += len;
137 }
138
139 ret = kernel_sendmsg(sock: vdev->ud.tcp_socket, msg: &msg, vec: iov, num: iovnum,
140 len: txsize);
141 if (ret != txsize) {
142 pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
143 txsize);
144 usbip_event_add(ud: &vdev->ud, VDEV_EVENT_ERROR_TCP);
145 err = -EPIPE;
146 goto err_tx;
147 }
148
149 kfree(objp: iov);
150 /* This is only for isochronous case */
151 kfree(objp: iso_buffer);
152 iso_buffer = NULL;
153
154 usbip_dbg_vhci_tx("send txdata\n");
155
156 total_size += txsize;
157 }
158
159 return total_size;
160
161err_tx:
162 kfree(objp: iso_buffer);
163err_iso_buffer:
164 kfree(objp: iov);
165
166 return err;
167}
168
169static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev)
170{
171 struct vhci_unlink *unlink, *tmp;
172 unsigned long flags;
173
174 spin_lock_irqsave(&vdev->priv_lock, flags);
175
176 list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
177 list_move_tail(list: &unlink->list, head: &vdev->unlink_rx);
178 spin_unlock_irqrestore(lock: &vdev->priv_lock, flags);
179 return unlink;
180 }
181
182 spin_unlock_irqrestore(lock: &vdev->priv_lock, flags);
183
184 return NULL;
185}
186
187static int vhci_send_cmd_unlink(struct vhci_device *vdev)
188{
189 struct vhci_unlink *unlink = NULL;
190
191 struct msghdr msg;
192 struct kvec iov;
193 size_t txsize;
194 size_t total_size = 0;
195
196 while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) {
197 int ret;
198 struct usbip_header pdu_header;
199
200 memset(&pdu_header, 0, sizeof(pdu_header));
201 memset(&msg, 0, sizeof(msg));
202 memset(&iov, 0, sizeof(iov));
203
204 usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum);
205
206 /* 1. setup usbip_header */
207 pdu_header.base.command = USBIP_CMD_UNLINK;
208 pdu_header.base.seqnum = unlink->seqnum;
209 pdu_header.base.devid = vdev->devid;
210 pdu_header.base.ep = 0;
211 pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum;
212
213 usbip_header_correct_endian(pdu: &pdu_header, send: 1);
214
215 iov.iov_base = &pdu_header;
216 iov.iov_len = sizeof(pdu_header);
217 txsize = sizeof(pdu_header);
218
219 ret = kernel_sendmsg(sock: vdev->ud.tcp_socket, msg: &msg, vec: &iov, num: 1, len: txsize);
220 if (ret != txsize) {
221 pr_err("sendmsg failed!, ret=%d for %zd\n", ret,
222 txsize);
223 usbip_event_add(ud: &vdev->ud, VDEV_EVENT_ERROR_TCP);
224 return -1;
225 }
226
227 usbip_dbg_vhci_tx("send txdata\n");
228
229 total_size += txsize;
230 }
231
232 return total_size;
233}
234
235int vhci_tx_loop(void *data)
236{
237 struct usbip_device *ud = data;
238 struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
239
240 while (!kthread_should_stop()) {
241 if (vhci_send_cmd_submit(vdev) < 0)
242 break;
243
244 if (vhci_send_cmd_unlink(vdev) < 0)
245 break;
246
247 wait_event_interruptible(vdev->waitq_tx,
248 (!list_empty(&vdev->priv_tx) ||
249 !list_empty(&vdev->unlink_tx) ||
250 kthread_should_stop()));
251
252 usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
253 }
254
255 return 0;
256}
257

source code of linux/drivers/usb/usbip/vhci_tx.c